<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8"/>
        <title></title>
        <style type="text/css">
            div{color: red;}
        </style>
    </head>
    <body>
        <div>绿叶学习网</div>
        <p>绿叶学习网</p>
        <span>绿叶学习网</span>
        <div>绿叶学习网</div>
    </body>
</html>